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livetrax/libs/canvas/rectangle.cc

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/*
Copyright (C) 2011-2013 Paul Davis
Author: Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <iostream>
#include <cairomm/context.h>
#include "pbd/stacktrace.h"
#include "pbd/compose.h"
#include "canvas/canvas.h"
#include "canvas/rectangle.h"
#include "canvas/debug.h"
#include "canvas/utils.h"
using namespace std;
using namespace ArdourCanvas;
Rectangle::Rectangle (Group* parent)
: Item (parent)
, Outline (parent)
, Fill (parent)
, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
{
}
Rectangle::Rectangle (Group* parent, Rect const & rect)
: Item (parent)
, Outline (parent)
, Fill (parent)
, _rect (rect)
, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
{
}
void
Rectangle::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) const
{
/* Cairo goes a little (!) wrong when asked to fill/stroke rectangles that
* extend way beyond the surface boundaries. To avoid this issue,
* clamp what we are drawing using the absolute end of the visible
* canvas, converting to item-space coordinates, of course.
*/
Rect plot = _rect;
Rect visible = _canvas->visible_area();
Duple visible_end = canvas_to_item (Duple (visible.x1, visible.y1));
plot.x1 = min (plot.x1, visible_end.x);
plot.y1 = min (plot.y1, visible_end.y);
if (_fill) {
setup_fill_context (context);
context->rectangle (plot.x0, plot.y0, plot.width(), plot.height());
if (!_outline) {
context->fill ();
} else {
/* special/common case: outline the entire rectangle is
* requested, so just use the same path for the fill
* and stroke.
*/
if (_outline_what == What (LEFT|RIGHT|BOTTOM|TOP)) {
context->fill_preserve();
setup_outline_context (context);
context->stroke ();
} else {
context->fill ();
}
}
}
if (_outline) {
if (_outline_what == What (LEFT|RIGHT|BOTTOM|TOP)) {
/* if we filled and use full outline, we are already done */
if (!_fill) {
context->rectangle (plot.x0, plot.y0, plot.width(), plot.height());
setup_outline_context (context);
context->stroke ();
}
} else {
if (_outline_what & LEFT) {
context->move_to (plot.x0, plot.y0);
context->line_to (plot.x0, plot.y1);
}
if (_outline_what & BOTTOM) {
context->move_to (plot.x0, plot.y1);
context->line_to (plot.x1, plot.y1);
}
if (_outline_what & RIGHT) {
context->move_to (plot.x1, plot.y0);
context->line_to (plot.x1, plot.y1);
}
if (_outline_what & TOP) {
context->move_to (plot.x0, plot.y0);
context->line_to (plot.x1, plot.y0);
}
setup_outline_context (context);
context->stroke ();
}
}
}
void
Rectangle::compute_bounding_box () const
{
Rect r = _rect.fix ();
_bounding_box = boost::optional<Rect> (r.expand (_outline_width / 2));
_bounding_box_dirty = false;
}
void
Rectangle::set (Rect const & r)
{
/* We don't update the bounding box here; it's just
as cheap to do it when asked.
*/
begin_change ();
_rect = r;
_bounding_box_dirty = true;
end_change ();
DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (set)\n");
}
void
Rectangle::set_x0 (Coord x0)
{
begin_change ();
_rect.x0 = x0;
_bounding_box_dirty = true;
end_change ();
DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (x0)\n");
}
void
Rectangle::set_y0 (Coord y0)
{
begin_change ();
_rect.y0 = y0;
_bounding_box_dirty = true;
end_change();
DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (y0)\n");
}
void
Rectangle::set_x1 (Coord x1)
{
begin_change ();
_rect.x1 = x1;
_bounding_box_dirty = true;
end_change ();
DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (x1)\n");
}
void
Rectangle::set_y1 (Coord y1)
{
begin_change ();
_rect.y1 = y1;
_bounding_box_dirty = true;
end_change ();
DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: rectangle change (y1)\n");
}
void
Rectangle::set_outline_what (What what)
{
begin_change ();
_outline_what = what;
end_change ();
}
void
Rectangle::set_outline_what (int what)
{
set_outline_what ((What) what);
}